The Grand Prismatic Spring in Yellowstone National Park takes the record for being the largest hot spring in the United States (and the third largest in the world). It's also undoubtedly one of the most colorful places on the planet.

What causes those vibrant colors, you ask? They are a result of a variety of microbes and bacteria growing around the water's edge. And if it looks that cool in a photograph, we can only imagine how amazing it must be to experience IRL.